Temper condition: annealed
Specs : according to ASTM B708 -98 UNS R05200 & ASTM B708 -98 UNS R05400.
Chemical composition : 
            O         0.0150 %max    (0.0300%max for R05400)
            C         0.0100 %max
            N         0.0100 %max
            H         0.0015 %max
            Fe       0.0100%max
            Ni        0.0100%max
            Si        0.0050 %max
            Ti        0.0100 %max
            Mo       0.0200 %max
            W        0.0500 %max
            Nb       0.1000 %max
            Ta balance (typically 99.92%)
Physical & Mechanical property : 
Tantalum sheet + Tantalum strip 
            Tensile strength  207 MPa min.
            Yield strength     138 MPa min.
            Elongation          20%min 
Tantalum plate 
            Tensile strength  172 MPa min.
            Yield strength     103 MPa min.
            Elongation          30%min 
Size available :
Tantalum sheet + Tantalum strip
Thickness .0040" up to .0158" x Width up to 24" x Length up to 40"   or
Thickness 0.10 up to 0.40mm x Width up to 609.60mm max x Length up to 2000mm max.

Thickness .0158" up to .060" x Width up to 40" x Length up to 80"   or
Thickness 0.40 up to 1.524mm x Width up to 1000mm max x Length up to 2000mm max.

Tantalum plate
Thickness .060" up to .50" x Width up to 40" x Length up to 80"   or
Thickness 1.525 up to 12.70mm x Width up to 1000mm max x Length up to 2000mm max.

Typical size:
1.5mm Thickness x300mm x1600mm (weight 12.3 kg/pc)
4.0mm x 70mm x 70mm   (weight=0.345kg)
2.0mm x 38mm x 290mm (weight=0.389kg)

1.0mm Thickness x160mm x780mm (weight 2.211 kg/pc)
1.0mm Thickness x300mm x1600mm (weight 8.08 kg/pc)
1.0mm Thickness x300mm x300mm (weight=1.52 kg/pc)
0.5mm Thickness x 500mm x 500mm
0.5mm Thickness x 500mm x 1000mm
0.4mm Thickness x 305mm x 455mm
0.4mm x 300mm x 775mm  (weight=1.5872kg/pc)

0.2mm(+/-0.01)Thicknessx 50mm (+/-0.5) x 330mm (+/-0.5);
0.2mm(+/-0.01)Thickness x 60mm (+/-0.5) x 330mm (+/-0.5);
0.125mm Thickness x 300mm x 300mm  (weight=0.22 kg/pc)
0.1mm(+/-0.01)Thickness x 60mm (+/-0.5) x 330mm (+/-0.5), weight＝0.033 kg/pc)
0.1mm(+/-0.01)Thickness x  50mm (+/-0.5) x 330mm (+/-0.5);
0.1mm Thickness x300mm x 300mm (weight=0.152 kg/pc)
0.1mm Thickness x300mm x 500mm (weight=0.267 kg/pc)

0.05mm Thickness X 56mm X 108mm
0.05mm Thickness X 76mm X 500mm
0.05mm Thickness X 76mm X 500mm
0.05mm Thickness x width 150mm x 500mm;
0.05mm Thickness x width 300mm x length 600mm;

Thickness .005"-.009" x Width up to 4"  x Random length;
Thickness .001"-.010" x Width up to 12" x Random length;
Thickness .010"-.020" x Width up to 24" x Random length;
Thickness .025"-.500" x Width up to 24" x Random length;
Thickness .500"-4.00" x Width up to 26" x Random length;

Typical application:
Tantalum sheet is made into Tantalum sleeve fitted over a stainless steel thermowell provides an economical way to protect against corrosion, because thermocouples are the most widely used process sensor, meanwhile are often used to protect thermocouples when monitoring the temperature of highly corrosive chemical solutions and agents. Solid machined and drilled tantalum thermowells are good for these applications. usually to save money, a thin tantalum sleeve (or tantalum sheet with 0.013 - 0.015 inch thick) is often used. This is fitted over a
thermowell made of type 316 stainless steel.

Trade name:  Ta sheet, Ta sheets, Ta plate, Ta plates, tantalum back, tantalum board, tantalum strip, tantalum foil, tantalum plate, tantalum sheet, tantalum foil,  tantalum strip, tantalum band, tantalum ribbon, tantalum plates, tantalum sheets, tantalum foils, tantalum strips, tantalum bands, tantalum ribbons, tantalum alloy plate, tantalum alloy sheet, tantalum alloy foil, tantalum alloy strip, tantalum alloy band, tantalum alloy ribbon, tantalum alloy plates, tantalum alloy sheets, tantalum alloy foils, tantalum alloy strips, tantalum alloy bands, tantalum alloy ribbons, tantalum film, tantalum thin film, tantalum gasket, tantalum gaskets, tantalum clad, tantalum cladding, tantalum liner, tantalum shield, tantalum layer, tantalum layers, ta slab, ta slabs, tantal slab, tantal slabs, tantalum slab, tantalum slabs, tantalum liner plate, lining plate, backing plate, tubing plate, tube plate, tubular plate, etc.,

Standard Specification ASTM B 708 -05 for Tantalum Ribbon, Tantalum Alloy Ribbon, Tantalum Strip, Tantalum Alloy Strip, Tantalum Foil, Tantalum Alloy Foil, Tantalum Sheet, Tantalum Alloy Sheet, Tantalum Plate, Tantalum Alloy Plate.

This specification covers unalloyed and alloyed Tantalum Ribbon, Tantalum Alloy Ribbon, Tantalum Strip, Tantalum Alloy Strip, Tantalum Foil, Tantalum Alloy Foil, Tantalum Sheet, Tantalum Alloy Sheet, Tantalum Plate, Tantalum Alloy Plate as follows:
1. ASTM B 708 -05 UNS R05200, unalloyed tantalum, electron-beam furnace or vacuum-arc melt, or both.
2. ASTM B 708 -05 UNS R05400, unalloyed tantalum, powder-metallurgy consolidation.
3. ASTM B 708 -05 UNS R05255, tantalum alloy, 90% tantalum 10% tungsten, electron-beam furnace or vacuum-arc melt, or both.
4. ASTM B 708 -05 UNS R05252, tantalum alloy, 97.5% tantalum 2.5% tungsten, electron-beam furnace or vacuum-arc melt, or both.
5. ASTM B 708 -05 UNS R05240, tantalum alloy, 60% tantalum 40% columbium, electron-beam furnace or vacuum-arc melt.